JPH02504594A - Thread cutting accessory device for multi-needle sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Thread cutting accessory device for multi-needle sewing machine Background of the invention This invention allows multiple threads on a workpiece to be sewn with a multi-needle sewing machine to be sewn in a single, controlled manner. The present invention relates to a method and apparatus for cutting in the process.

The use of multi-needle sewing machines that form multiple rows of stitches at the same time can complete a wide variety of workpieces. significantly reduces the amount of time it takes to However, such multi-needle operation There's a problem. For example, when completing a workpiece with multiple rows of stitches, the needle The operator manually cuts the numerous threads that extend through both the There is a delay in starting the sewing operation. Generally, do not pull out the workpiece from the sewing machine. Since the thread must be cut with scissors, it may be difficult for the operator to quickly cut the thread by hand. Ru. The operator always sews the workpiece so that the thread is visible and accessible. This type of hand operation is difficult because it must be pulled too far from the machine. Wastes time and thread, resulting in too much thread remaining on the needle and louvers Or, the length of thread attached to the finished item is too long.

Traditionally, various types of automatic thread trimmers cut the thread extending from the needle and looper. It has been improved. Prior art multi-thread cutting devices often require individual thread cutting devices to cut each thread. U.S. Pat. No. 31,398 to Cohen et al. As shown in No. 48, it is essential for the sewing method itself, so it is necessary to Requires a sewing machine specially made for the application. In addition, Marfolio (Ma Others, such as U.S. Pat. No. 3,532,065 for Since the yarn is pulled out of the production area and cut, in at least some cases unnecessary In short, increase the length of the thread.

Many prior art devices have limitations regarding the number of threads that can be cut. In other words, there is In some cases, it is necessary to stagger the needles so that separate cutting elements can be applied to individual threads. There is a point. Therefore, as in the case of Cohen et al.'s device, many It cannot be used by adapting it to the shape of Others in many prior art means The feature is that two cutting tools are used, one for cutting the thread of the needle and the other for cutting the thread of the needle. One is for cutting the looper thread. That is, at least in some devices can only be used at the end of the workpiece, not in the middle of the work. .

Summary of the invention The present invention is designed to cut many threads extending from the workpiece to both the needle and the looper. This is an improved method and device for cutting both threads in a set. Use a cutting member. When the sewing machine operator finishes sewing the workpiece, or When you want to cut the thread for some reason, you can use the cutting point in addition to the normal operating position. The operator moves the foot-operated control pedal to the cutting position. move. As a result, the motion control unit stops the needle at the raised position and presses the sewing machine. goes up.

At the same time, the thread loosening unit works to create slack in the thread leading to the needle and looper. Tightly fix the thread coming from the stand. The operator presses the workpiece until the thread is no longer loose. Pull the piece backwards away from the stitch area to pull the thread taut. When the thread is stretched, A cutting member provided below the workpiece and above the looper operates forward, Cut the thread from both the needle and looper.

Therefore, it is an object of the present invention to move the cutting blade below the workpiece forward to remove all the threads. By cutting at the same time, the material extends from the work piece to the looper and needle of the multi-needle sewing machine. An object of the present invention is to provide an improved method and apparatus for cutting a large number of threads with a cutting blade.

Another object of the invention is to actuate a thread tensioning foot extending to the needle and looper. Create a slack in the thread, fit the thread into the thread stopper, and hold the thread so that the operator can move the workpiece later. It maintains the tension of the thread when pulled in the opposite direction, allowing the cutting tool to cut all the threads at once. To adjust the length of thread cut in multi-needle sewing machine by An object of the present invention is to provide an improved method and apparatus.

Still another object of the present invention is to extend from a workpiece to be sewn by a multi-needle sewing machine. Make sure to leave enough thread so that the thread extending from the needle and looper of the sewing machine can be used for the next sewing operation. Improvements for cutting with a thread cutter so that it remains on the needle and looper An object of the present invention is to provide a method and apparatus.

Still another object of the invention is a cutting means that cuts all threads simultaneously in one cutting operation. When the operator works, the thread extending from the needle and looper to the workpiece is For multi-needle sewing machines where it is possible to cut a piece by pulling it backwards. The purpose is to provide additional equipment.

Other objects, features and effects of the invention will be apparent from the detailed description below together with the accompanying drawings. It will become clear.

Brief description of the drawing FIG. 1 is a front perspective view of a multi-needle sewing machine equipped with a thread cutting accessory.

FIG. 2 is an elevational view showing the operation of the cutting blade in the area of the needle.

FIG. 3 is a perspective view of the cutting blade and the device operated by it.

detailed description According to FIG. 1, a shaft 16 (FIG. 2) and a plurality of rows attached to the needle drive plate 14 A sewing machine is shown having a head extending from which sewing needles 13 are aligned. Thread 1 A plurality of slits 17 of 8 are attached to the sewing machine 11 and thread 18 is attached to a plurality of creels or threads. is supplied to the conditioning means 19.

The thread from the creel 19 passes through the first thread guide 21 and the second thread guide 22, and is then passed through the thread stopper tension set. through the solid body 23, which will be described more fully later, through the third thread guide 24, It reaches the needle 13 through the thread tension guide 26 and the fourth and fifth thread guides 27,28.

The looper thread supply section is basically the same as the needle thread supply section, and is installed adjacent to the sewing machine. It has a tip 29 of a plurality of threads 31. The thread 31 from the tip is connected to the creel 32, the first , passes through the second thread guide 33. The thread 31 is transferred from the thread guide 34 to the thread stop tension assembly 36 and the thread It passes through the guide 37, thread tension member 38, and thread guide 39 to reach the looper 41 (Fig. 2). Ru. As previously mentioned, the apparatus of FIG. With the exception of guides 22, 24, 34, and 37, this is a standard multi-needle sewing machine; This will be discussed more fully later.

The sewing machine 11 is controlled by a control pedal operated by the operator. The pedals are connected to a control box 44 by a crank assembly 43.

The control box 44 also includes a drive motor 46 and many elements of the yarn cutting device of the present invention. Control. The entire sewing pattern is turned on and off by appropriate switches 47.

A cutting device 49 of the present invention is mounted on a bed 48 of the sewing machine 11.

Cutting device 49 cuts cylinder and piston assembly 51 as depicted in FIG. It is equipped with hydraulic or gas supply pipes 52 and 53 for fluid or gas. is controlled by air pressure. The piston rod 50 moves the slide plate 54 back and forth. A cutting blade holding arm 55 and a cutting blade holding block 56 are moved and connected to this. , moves the optical cutting blade 57 laterally. While the cutting blade 57 reciprocates, the slide plate The pilot valve 60 is actuated by the extension portion 54a of the port 54. In figure 2 As can be seen, the blade 57 is on the bed 48 and throat plate 58, and is on the work piece 59 and the presser foot. 61 at a certain position. Pull the workpiece 59 in the sewing area to correct it. Feed rollers 62,63, which serve the purpose of close alignment, are shown in FIG. Sending The gear teeth 64 (FIG. 3) also function to feed the workpiece 59 in the sewing area. The feed dog , is a standard equipment on most sewing machines.

In FIG. 2, the outline of the optical cutting blade 57 in its normal position is indicated by a broken line in front of the needle. and remains there during the sewing operation. Also, the light cutting blade is at the cutting position. is written as a solid line. In FIG. 3, the blade 57 is depicted in its normal position.

Returning to FIG. 1, the upper thread stop tension assembly 23 is connected to the first thread stop or nipper cylinder. - a piston 66, which is actuated by pneumatic or hydraulic power. piston Rod extension 67 has a free end such that foot 68 fits within U-shaped plate 69. It is designed to suit the needs of the sea urchin. As seen in FIG. 69 and passes below shoe 68. piston cylinder - When the unit 66 is actuated, the shoe 68 is driven downward against the thread 18 and Press them tightly against the rate 69, thereby effectively stopping the thread. assembly 23 also includes a second thread stop or nipper cylinder piston 71, an extended piston It has a tongue rod 72, a foot 73, and a plate 74, and serves as the main thread stopper. It works in the same way as the original. Between the thread stop elements 65 and 71 there is a thread tension cylinder. - The piston 76 is located, and the piston rod 77 that is extended from this A foot 78 is attached to the far end. Cylinder/piston unit 76 operates Then, the foot 78 presses down the thread 18, and the thread stopper foot 73 and creel 19 Create slack in the threads extending between the two.

The bobbin thread stop tension assembly 36 is substantially identical to the needle thread assembly 23 and is similar to the upper thread assembly 23. 3 operates the looper thread 31 in the same way that the needle thread 18 is operated. The assembly 36 is , cylinder/piston unit 81, extended piston rod 82, foot 83 and a first thread stopper unit having a plate 84. 2nd thread stop The second unit includes a cylinder/piston unit 86 and an extended piston rod. 87, a foot 88 and a plate 89. Between units 81 and 86, the extension Tension cylinder and piston unit 9 with a rod 92 and a foot 93 There is 1. The fluid pipe 94 is connected to the unit 81, the fluid pipe 96 is connected to the unit 86, and the fluid pipe 96 is connected to the unit 86. 97 supplies working fluid to the units 91, respectively.

Both assemblies 23.36 are shown to be operated by either hydraulic or pneumatic pressure. Although described and described, it can also be operated by a solenoid. In addition, fluid supply Elements such as are of standard design and well known in operation, so both water and gas Not shown.

The thread cutting unit 49 and the thread stop tensioning unit 23, 36 are essential to the sewing machine 11. It is not a bulky part and can be easily installed. At the same time, these factors vary It constitutes an uncut assembly that can be easily attached to a standard sewing machine.

Operation During normal sewing operations, none of the piston units in assembly 23.36.49 are actuated. First, the cutting blade 57 is in the normal position shown in FIG. ．． 83, 88 and 93 are in the upward position and do not touch the threads 18 and 31. do not have. When the sewing work is completed or the operator cuts the thread for some reason. When desired, the operator moves the foot pedal 42 (Figure 1) to the cutting position. Lend. A control connected to the control pedal 42 by a control rod 43 and a coupling member. The motion control means of the control box 44 move the hands 13.15 in synchrony with the movement of the control pedal. Then, raise the presser foot 61 and release it from the work piece 59. Such control means are used in most sewing This is standard equipment on aircraft, examples include U.S. Pat. No. 3,590,969 and No. 3804043. Immediately thereafter, piston units 71 and 8 6 operates and stops the needle thread and looper thread. While the thread is stopped, the thread tension unit 76 and 91 are activated, pressing down the thread, and the activated thread stopper 71.86 and creel Make some slack in the thread between. When the thread is compressed and loosened, it will appear in Figure 1. As shown, the thread stopper unit 66.81 is actuated to stop the thread, and the thread stopper unit 7 1.86 separates and leaves a loose thread on the thread extending from the activated thread stop to the needle and louver. Leave a loop.

When slack is formed in the needle thread and looper thread, the operator can pull the workpiece backwards. Pull the loose thread leading to the needle and louver. and cutting piston unit is activated and the cutting blade 57 passes through the sewing area and removes the thread coming from both the needle and the louver. , cut with the thread remaining on the needle and louver. Create slack in the thread before cutting One purpose is to have enough thread to avoid threading the needle or louver. and to ensure that a sufficient length of thread remains on the workpiece. .

The timing of the various processes is controlled by a control box 44 and can be adjusted to suit the operator. You can change it so that However, the order is the same.

A single straight-edged cutting blade 67 is depicted for cutting the thread extending from the workpiece. Although described, other thread cutters can be substituted for the blade if necessary. Wear. For example, a single saw blade or a pair of reciprocating saw blades can be used. Alternatively, other cutting tools that are relatively flat and pass under the workpiece can be used. Ru.

The foregoing is a description of the invention in its preferred embodiments. many variants, Additions or deletions can be easily made by those skilled in the art without departing from the spirit and scope of the invention. It will be done.

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Claims (15)

[Claims] 1. A thread supply section, and a plurality of reciprocating needles and louvers that receive thread from the thread supply section. -, a presser foot, a means for feeding the workpiece below the needle, and a needle when the needle and presser foot are in the raised position. In an accessory device for a multi-needle sewing machine of the type having an operation control means for stopping the movement of , a cutting member usually located in front of the needle; Move the cutting member in the direction of movement of the workpiece, from the position in front of the needle to below the needle and presser foot. and pass through an area below the workpiece and above the louver to remove the workpiece. cutting member moving means for cutting the thread extending from the louver in contact with the thread; and An accessory device characterized by comprising: 2. A first thread stopper tensioning means is provided for creating slack in the thread extending from the thread supply section to the needle. It is further characterized in that the thread is tensioned when the work piece is pulled from the sewing area. Contains means to keep the An accessory device according to claim 1. 3. Equipped with a second thread stopper tensioning means for creating slack in the thread extending from the thread supply section to the louver. It is further characterized in that the thread is tensioned when the work piece is pulled from the sewing area. Contains means to keep the An accessory device according to claim 2. 4. It includes a cutting member having a horizontal cutting blade and a piston connected to the cutting blade. and said cutting member moving means having a fluid actuated cylinder. The accessory device according to claim 1. 5. It has a plurality of needles, a louver, and a thread supply section that supplies thread to the needles and the louver. A multi-needle sewing machine comprising first and second thread control means, Each of the first and second thread control means is positioned between the needle and the louver and the thread supply thereto. a thread tensioning member and a first thread stopper member, Each of the first thread stop members includes a thread stop foot and a thread stop plate; A multi-needle sewing machine, wherein each of the thread tensioning members includes a thread tensioning foot. 6. Each of the yarn control means further comprises: the first yarn stopper of the yarn tensioning member; It is further characterized by including a second thread stopper provided on the opposite side, the second thread stopper being provided on the opposite side. the retaining member includes a thread stopper foot and a thread stopper plate; Yarn control means according to claim 5. 7. Each of the thread stop members and each of the thread tension members are fluid actuated cylinders. and a piston, and the piston rod is extended and has the foot attached thereto. 6. Yarn control means according to claim 5, further comprising a thread control means. 8. A plurality of reciprocating needles and louvers, a presser foot, and a workpiece are guided along the path below the needles. a feeding means that moves the thread along the needle, a thread supply that supplies the thread to the needle and the louver, and a needle and presser foot. In a multi-needle sewing machine, the machine includes an operation control means that stops the operation of the needle when the needle is raised. , a cutting means located in front of the needle; When the needle and presser foot are in the raised position, insert the cutting means below the needle and presser foot onto the workpiece. Move it in the direction of the path and cut it in contact with the thread extending from the work piece to the louver. means and Improvements that include. 9. In multi-needle sewing machine, It is characterized by comprising first and second yarn control means, each of the yarn control means The first step is to create an appropriate amount of slack in the thread by pulling the thread from the feeding section to the needle and louver. and a second thread tensioning means to prevent the thread from being excessively drawn towards the needle and the louver. and a thread fastening means. Improvement according to claim 8. 10. In multi-needle sewing machine, Each of the cutting member moving means, the thread pulling means, and the thread stopping means are fluid-driven. Claim 9 further characterized in that it has an actuated cylinder and piston. Improvements described in section. 11. Thread extending from the needle and louver of a multi-needle sewing machine to the workpiece being sewn by the sewing machine In the cutting method of The process that ends with Pull the needle thread and louver thread further from the thread source and pull the workpiece away from the needle. The process of pulling the cutting member below the workpiece in the opposite direction to the direction in which the workpiece was pulled. The process of moving, The thread extending from the work piece to the louver of the sewing machine is engaged with the cutting member and cut. process and A thread cutting method consisting of: 12. When the workpiece is pulled away from the needle, excess needle thread is released from the needle thread supply source. Claim 11, further comprising the step of preventing being pulled. The thread cutting method described above. 13. When the workpiece is pulled away from the louver, the louver thread The claim further includes the step of preventing excessive tension from the yarn supply source. The yarn cutting method according to item 12. 14. As more thread is drawn from the needle thread supply, the thread is pulled away from the needle. The thread cutting method according to claim 13, further comprising a step of preventing Law. 15. When the louver thread is further drawn out from the louver thread supply source, the thread is pulled. Claim 1 further comprising the step of preventing the louver from leaving the louver. The thread cutting method according to item 14.